Vulnerabilities in Google Chrome Allow for Arbitrary Code Execution

In support of the Red Sky Alliance Small Business Alliance, we are providing an MS-ISAC ADVISORY (No. 2018-084). This warning was presented on 25 July 2018, which outline multiple vulnerabilities were discovered in Google Chrome; the most severe of which could result in arbitrary code execution. Google Chrome is a web browser used to access the Internet. These vulnerabilities can be exploited if a user visits, or is redirected to, a specially crafted web page. Successful exploitation of the most severe of these vulnerabilities could allow an attacker to execute arbitrary code in the context of the browser, obtain sensitive information, bypass security restrictions and perform unauthorized actions, or cause denial-of-service conditions.

THREAT INTELLIGENCE

There are currently no reports of these vulnerabilities being exploited in the wild. As of 25 July 2018, Google Chrome shows a “Not secure” designation on any website running Hyper Text Transfer Protocol (HTTP) instead of Hyper Text Transfer Protocol Secure (HTTPS), which may give users the perception the sender is unsecure.

SYSTEMS AFFECTED

Google Chrome prior to 68.0.3440.75

RISK

Government:

Large and medium government entities: High
Small government entities: Medium

Businesses:

Large and medium business entities: High
Small business entities: Medium

Home users: Low

TECHNICAL SUMMARY

Multiple vulnerabilities have been discovered in Google Chrome, the most severe of which could result in arbitrary code execution. These vulnerabilities can be exploited if a user visits, or is redirected to, a specially crafted web page. Details of the vulnerabilities are as follows:

CORS bypass in Blink (CVE-2018-6168)
Cross origin information leak in Blink (CVE-2018-4117, CVE-2018-6177)
Heap buffer overflow in WebGL (CVE-2018-6154, CVE-2018-6162)
Heap buffer overflow in WebRTC (CVE-2018-6156)
Integer overflow in SwiftShader (CVE-2018-6174)
Local file information leak in Extensions (CVE-2018-6179)
Local user privilege escalation in Extensions (CVE-2018-6176)
Permissions bypass in extension installation (CVE-2018-6169)
Request privilege escalation in Extensions (CVE-2018-6044)
Same origin policy bypass in ServiceWorker (CVE-2018-6159, CVE-2018-6164)
Same origin policy bypass in WebAudio (CVE-2018-6161)
Stack buffer overflow in Skia (CVE-2018-6153)
Type confusion in PDFium (CVE-2018-6170)
Type confusion in WebRTC (CVE-2018-6157)
UI spoof in Extensions (CVE-2018-6178)
URL spoof in Chrome on iOS (CVE-2018-6160)
URL spoof in Omnibox (CVE-2018-6163, CVE-2018-6165, CVE-2018-6166, CVE-2018-6167, CVE-2018-6172, CVE-2018-6173, CVE-2018-6175)
Use after free in Blink (CVE-2018-6158)
Use after free in WebBluetooth (CVE-2018-6171)
Use after free in WebRTC (CVE-2018-6155)

Successful exploitation of the most severe of these vulnerabilities could allow an attacker to execute arbitrary code in the context of the browser, obtain sensitive information, bypass security restrictions and perform unauthorized actions, or cause denial-of-service conditions.

MITIGATION

Recommendations:

Apply the stable channel update provided by Google to vulnerable systems immediately after appropriate testing.
Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.
Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources.
Apply the Principle of Least Privilege to all systems and services.

REFERENCES:

Google:

https://chromereleases.googleblog.com/2018/07/stable-channel-update-for-desktop.html

Mitre CVE:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-4117

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6044

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6153

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6154

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6155

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6156

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6157

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6158